Quote Originally Posted by Cassar View Post
I just feel like the situation wasn't treated with the gravity it should've been. I mean come on, there's an individual in this world that can see the GODDAMN FUTURE!!! That's like the most useful ability in this entire universe!!
The thing is, it's "can see the future, but with a lot of limits that render it not very useful". She can't do it on demand and it usually doesn't show people in peril, and it sounds like it might be mostly about giving her occasional fortunate insights into how to solve a project she was personally working on.

Her full explanation if you question her about it in Bozja:

The Echo can manifest itself in myriad ways dependent on the individual. I was gifted with the ability to peer into the future.
It is a power much like prophetic dreams and divinations, and yet quite different, for such visions only tell of the future's potential.
The Echo does not show me what may happen, but what will happen.
Scholars speculate Mezaya Thousand Eyes too shared this gift, hence the alarming accuracy of the passages writ in her Divine Chronicles.
These visions are a decidedly rare occurrence, usually containing some crucial insight into matters presently unfolding before me. For better or worse, I have never had visions of an impending threat on my life or those around me.
Not that I would want to see such things, of course. Could you imagine, knowing of certain doom that cannot be avoided?
I once spoke of my visions to an acquaintance─a relatively harmless glimpse of the future─and it resulted in a terrible argument. I fear I could not bear the weight of grimmer tidings...
But that is neither here nor there. My gift is but a trivial thing. Nothing you should think to rely upon.

The way she brings up "prophetic dreams" as a reference point suggests that they might not be all that uncommon in the setting (although it could be a bad choice of words in an isolated corner of the narrative, and they've contradicted bigger things than that). We do have other things like the Namazu's "do this thing to prevent disaster" vision on one hand, and Temulun's seemingly accurate and insightful prophecies on the other – though in the latter case it is suggested that she too has the Echo.

In any case, for Mikoto specifically, there is likely little benefit in advertising her future sight abilities to others.